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| ale5000 |
| Posted: Feb 28 2011, 11:39 PM |
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Advanced Member
Group: Members
Posts: 1114
Member No.: 22180
Joined: 30-September 07
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There is a new option in the latest test build of VirtualDub: "Use video stream fccHandler in codec search".
What is it doing?
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New VirtualDub forum
VirtualDub AIO (All-in-One installer for VirtualDub and plugins)
Codec Toolbox RS (A tool to read/change merit of codecs and many other things)
Input plugins for VirtualDub / ACM codecs / VFW codecs |
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| dloneranger |
| Posted: Mar 1 2011, 05:38 AM |
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Moderator
Group: Moderators
Posts: 2366
Member No.: 22158
Joined: 26-September 07
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An avi has two fourcc's associated with the video in it
One's the video fourcc, one's the codecs
This option lets you choose which is used for picking which codec to use for decoding
eg
xvid and ffdshow can both be set to use dx50 as their fourcc in their options
That'll give 3 different combinations of the codecs and the videos fourcc
divx -> divx dx50
xvid -> xvid dx50
ffdshow -> ffds dx50
When you decode the video, virtualdub has to choose a codec to use
If it uses the second codec (dx50) the same codec will be tried for all 3
If it uses the first it'll try to use the 3 different codecs
This can be handy if your codec settings for eg packed bitstreams is different in xvid and divx
Or if you prefer to encode with xvid, but decode with ffdshow
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MultiAdjust JoinWav WavNormalize FFMPeg Input Plugin v1827 UnSharpMask
Windows7/8 Codec Chooser
All FccHandlers Stuff inc. Installers for acm codecs AAC, AC3, LameMp3 |
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| ale5000 |
| Posted: Mar 1 2011, 10:42 PM |
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Advanced Member
Group: Members
Posts: 1114
Member No.: 22180
Joined: 30-September 07
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If I have both x264vfw and ffdshow set for the AVC1 fourcc and it always choose ffdshow (with both the option enabled and disabled).
So what is the difference?
--------------------
New VirtualDub forum
VirtualDub AIO (All-in-One installer for VirtualDub and plugins)
Codec Toolbox RS (A tool to read/change merit of codecs and many other things)
Input plugins for VirtualDub / ACM codecs / VFW codecs |
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| dloneranger |
| Posted: Mar 1 2011, 11:07 PM |
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Moderator
Group: Moderators
Posts: 2366
Member No.: 22158
Joined: 26-September 07
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Dunno, you'd have to check the source code - it's the bool fccHandlerSearch in videosource.cpp
(My version uses some different code in that section)
It's not the same as force video handler, so I'd guess it just affects which one is searched for first
What are the two fourcc's in the source?
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MultiAdjust JoinWav WavNormalize FFMPeg Input Plugin v1827 UnSharpMask
Windows7/8 Codec Chooser
All FccHandlers Stuff inc. Installers for acm codecs AAC, AC3, LameMp3 |
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| phaeron |
| Posted: Mar 5 2011, 10:02 PM |
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Virtualdub Developer
Group: Administrator
Posts: 7773
Member No.: 61
Joined: 30-July 02
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This setting only matters if you have the codecs that were originally used to encode the video. The reason I added this option was that previously the codec fourcc was included in the search, which meant that the codec that was used on your system sometimes depended on what was used to encode it, and two videos that used the same compression sometimes opened with different codecs for no apparent reason. The default is now to ignore the codec fourcc so that, for instance, all XVID encoded files open with the same codec. |
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